Valve



Allg.V 5,` 193;). .I y;..|...| ARMSTRQNG El ALA 1,7725199 VALVE Filed oct. 22, 192,8

Patented Aug. 5, 1930 UNITED-'STATES g g PAT-ENT oFFlcE f voLIRFoRD HARRY ARlirsrRolvey AND JAMES4 GoRDoN, YoF LONDON, ENGLAND, AssIGNoRs j I'.110 lJ'AIIEIS GORDON & COMPANY GREAT ,BRITAINV LIMITED, OF LONDON, ENGLAND', A COMPANY OF VALVE Appliauon mea october 2g, 192s, serial No. 314,259, anavin Great Britain ocfobe as, 19,271

' lThis invention relates tovalves and inl particular tov those, usually automaticallyA operated, used to control the'flow of fluids in accordance with changes in the temperature, 5 pressure or other properties of the fluid.

to provide a satisfactory valve of the above general type, and although balanced or .sub-y' stantially balanced valves both of the liftV and rotary kind have been employed, the fluid had direct access to thevalveseatings, and the valves themselves in practice failed eitherto open or close 1n response to the movements of theircOnt-rollingmember, or 1n accordance with the changes in the properties of the fluid. The object of. this invention is to prol vide an improved valve of the rotary type which will not beopen to these disadvantages.

According to this invention the valve comi prises a casing or body having ports therein controlled by a movable valve member which is normally Vrotated tocontrol theports and is also'adapted to move longitudinally so as to vary theeilective area ,ofthe ports 1n accordance with changes in the pressure of the lluid,` ,passing through the valve. Preferably, the

movable valve member is'in the form of a hollow portedL piston adapted to rotate inav Y housing arranged at right angles to the direc- 30' tion in which the fluid enters they valve casing and in alignment with'the passage through which the outlet takes place'.v The movable valve member carries va spindle which is rotated from outside the casing in any vknown 35, manner and theclosed end of the movahlefv valve member, and, if desired, the endof its n e f a stuflng boX F? in the valve casing. The eX- pressure so that there isnormally a pressure l spindlealsof, is normally subjected to the inlet spring, diaphragm, or .othervthrust menlber,l

l.preferably adjustable` from outside the'casing, is provided' to Vbalance orlpartially bal- .j

ance the normal. inlet pressure.

ithe vfull inlet pressure having access tothe closed end of the movable valve member,- the latter is mounted' within a substantially 'stop valve,

v In an alternative arrangement instead .of

closed cylindrical housing both ends of which are in communication with ,the outlet pressure, that end ofthe housing,however, remote from the outlet being also'in communication,

Y o by means of a small leakhole, with the inlet Y Various proposals have hitherto been made pressure 2so thatthere isa tendencyfor the the effective area of the ports. In eitherl construction the valve may be so arranged ,thatV excessive outlet pressure causes the valve to move longitudinally'V so as to act asa checker In the accompanying drawings which show two constructions of valve accordingvto this invention designedl for` use with feed water @Figure 1 is alongitudinalsection through one form'of waterregulatingvalve 'fj Figure 2 is a diagram showing a steam gen-.`

u erator to which the valve illustrated inFigure u' port B at right angles to theoutlet port C.

yMounted withing the y casing is ya cylindrical housing Dhaving perforations Din its vhead and, its lopposite or open end `is in alignment4 with the outlet port'C. lRotatably,mounted l in the housing D isa hollow piston,E,`havi ng Y ports El., whichlcooperate with ports-D2 in the housing, and an open end E3. The closed end vor ,head ofthe piston is connected to a spindle F` which passes'through an opening-in the head ofthe housing and extends through posed portion of the spindle has :an extension l G which passes through `a stuliing box Glinto. a casing Hvconnected by a pipe H1 ,with theV pistonin a longitudinal direction. soas to reduce the elective area ofgth'e portsD?, E1

thrcigh which the liquid passes tothe outletA To cunteractihis pressure aspringK is interposed between a collar F on the spindle is rotatedto'admit more feed water. lIn 4addition to act as a check valve and-totally close f "atC 'The housing P is furnished @with ports-P1 which cooperate with ,ports O14 '40 marient` communication with the inlet' prest sure bythe provision of a small leak hole B2 lthe bore of which is smaller .than that ofthe tube C? so that there is apr-tendency for the within thevalve. bodyfhavinginlet ports in tion, however, to this rotary motion, the valve according to this invention can move in allongitudinal direction in response to changes in the pressure rfat `whichthe feed water is supplied through the inlet branch A1, so-that if this pressurerises, the piston ywill 4move to- .wards the outlet portlagainst the action of. the spring K and-thus reduce the effective area 'of the ports E1. j 4 l Y If,`on the other hand, the .feed pump should fail, the ,outlet pressure acting on the piston E will cause this to move in the opposite directhe ports D1. j Y Y ,n

'In the alternative construction of valve diagrammatically illustrated in Figure 3, the..

casing-A1 is ,providedivith an inletport B1 andoutlet port C1., but insteadofthe inlet pressure-having accessto the, closed end of the movable piston O, this is mountedwithin ,a housing vkl) which.extendsthroughout the length ofthe casing and both endsof this housing are .in yc ojinmunication H with the outlet pressure by vvmeans of. a` suitable v"balancing tube or conduit AC2 preferably .provided with a control -cook indicated in the pistonv to allow fluid entering at B1V to Vescape at C1. The-end of the housingP remote from the outlet 'portis placed `in pern piston 'toV move longitudinally in a direction "forms no part ofthe present invention; In

. Inother respects the rotationo'fffthe piston -O :may be keected through mechanism similar v tothatfalrea-dy described,.w`hich in itself both .the labo-ve constructions, by 'arranging thefinlet'at right angles "to the outlet and if j placingthe pist-'on valve so thaty it moves paris considerably 'reduced' and klas a result the VValve is 'more Sensitive andicanjbemore readily 'operated previous constructions, whatever the effective areafof the outlet ports 'due tothe longitudinalmovementof the valve f the particular requirements the valve is to fulfill without departing from this invention.

What we claim as our invention and desire to secure by Letters Patent is l. In a valve for controlling the i-ow of fluids, the combination of a valve body having an inlet vport and an'outlet port at right angles thereto, a fixed housing in the body "open" at one end in alignment with the outlet `port of the valve-'bodyland provided'fwith' inlet ports at right angles Ytosaidlopen end, a ported piston rotatably mountedwith-in said housing, avalve spindle secured to said piston extending outside the body, means on said spindle for rotating ther/'valve vvto control the ports. in the housing, a closed chamber linto which the end of the spindle extends, a

passage establishing communication between said ychamber and the interior ofthe valve body, and a passage in the fix'edhousingg;v

' ing an inletport and annoutlet port'at right angles thereto, a fixedl housing within the valve body having inlet ports at right angles to the outlet port, a hollow ported piston `rrotatably 4mounted withinfsaid housingsaid piston beingalso longitudinally movable yunder variationsin the pressure ofthe'fiuid to- .'vary thefeifective areafofthe ports itcontrols,

a pressure-equalizing. passage establishing'` communication betweenthe two ends of the ported housing containing the movable [pis-l Y Y ,F

ton, and a passage in the, housing through which the closed end ofthe piston is in addi- -tion exposed to Athei-n'let pressure ofthe fluid asset forth.

3.` In a valveifoir controlling the flow of vhavin-g inletand outlet ports, al fixed housing its walls andopen at one end; to forman outlet port, a ported pistonnrotatably mount- .ed within said housing, -a valvefspindle; secured to. said-piston extending "outside the body, means on Asaid 4spindle.- for.V rotating the valveto control the ports inthe housing, .ai closed .chamber into which theend of the interior ofthe valve bodyandl'a pasthe spindleextends, a passage establishing. l y communication Vbetween said chamber,` and vallel tothe outflow, wear of the'moving gparts 4.

sage Vin the fixed housing-through whichthe Y closed end. ofthe pistonis subjected tofthe pressure of theliuid, 'the valvefand its spindlegi being thus balanced and longitudinally movable underv variations infthefpressure olf ythe fluid tovary the'effective area `of,theports in fthe-housing l4.-

a vvalve `forj.controllingthe How ofi fluids, the combination of a valve body having inlet and outlet ports, a, fixed housing within the valve body having inlet ports, a hollow ported piston rotatably mounted Within saidt housing, said piston being also longitudinally movable under vathe closed end of the pistonis in addition exi 'posed to the inlet pressure of the Huid as set forth.

In testimony whereof we have signed our names to this specification.

CLIFFORD HARRY ARMSTRONG. JAMES GORDON. 

